Location, Typing And Research Teenagers’s Embedded Supernumerary Teeth In Maxillary Anterior By CBCT

Objective:Application of cone beam computed tomography (cone-beam computed tomography, CBCT) accurate location of Embedded Supernumerary Teeth in maxillary anterior operation, accurate determination of path, guide the operation removed, evaluation of CBCT clinical extraction of Embedded Supernumerary Teeth in maxillary anterior value. And the characteristics of Embedded Supernumerary Teeth in maxillary anterior teeth, including the number, shape, size, position, direction, the root growth of ambush whether bending, impact on adjacent teeth of children with reason and correlation analysis.Method:513patients were collected in February10,2011～2013year in March25the maxillary anterior impacted supernumerary teeth were enrolled from Tianjin Stomatological Hospital pediatric department, according to the inclusion criteria were randomly selected from158patients, a total of220supernumerary teeth as the research object, prior to surgery with conventional clinical examination and X-ray examination, and then underwent CBCT. By CBCT three-dimensional reconstruction imaging, analyze the characteristics of Embedded Supernumerary Teeth in maxillary anterior teeth, clear on the position, and position between adjacent teeth, determine the operation scheme and operation route, guiding operation extraction of Embedded Supernumerary teeth. And the application of Cramer Ⅴ coefficient calculation of correlation degree between indexes, each index of Embedded Supernumerary Teeth in maxillary anterior by correlation analysis.Result:1. The study of the158patients,124male children, and34female children, the prevalence of3.65:1, there are significant differences between boys and girls.2. In this study,158patients, aged4～15years,6～10years of age accounted for81.65%, mainly because of anterior teeth restoration period appears uneven and anterior teeth gap too large hospital;11～15years old, accounting for8.67%, mainly due to orthodontic treatment when shooting the panoramic tomography found;4years old～5years old, accounted for9.49%, mainly because of the treatment of other teeth the panoramic tomography found. A statistically significant correlation between age and reason for visit(p=0.000). 3. The study of the158patients,222supernumerary teeth, single supernumerary teeth of102people, accounting for64.56%; two supernumerary teeth of52people, accounting for32.91%;3supernumerary teeth for2people, accounted for1.27%;4supernumerary teeth for2people, accounted for1.27%.4. The study of the158patients,222supernumerary teeth, cone155, accounting for69.82%; nodular64, accounting for2823%; lateral incisor form3, accounting for1.35%, morphological correlation of age and supernumerary teeth had no statistical significance (p=0.906).5. Crown and root length of the222supernumerary teeth is8.4mm-20.4mm, crown width is4.1mm-10.5mm. Correlation between age and supernumerary tooth size had no statistical significance (crown length:p=0.266;crown width:p=0.891). Correlation of admissions gender and supernumerary tooth length was not statistically significant (p=0.219), a statistically significant correlation is gender and supernumerary tooth width (p=0.029), male patients of supernumerary tooth width is greater than the female children.6. Ambush position6in this study,222supernumerary teeth, palatal arch in173, accounting for73.93%; the arch of impacted14, accounting for6.31%; labial palatal ambush13, accounting for5.41%; the labial arch in1, accounting for0.45%.7. The study of the222supernumerary teeth, inversion of95, accounting for42.79%; horizontal impacted74accounting for33.33%; positive impacted33, accounted for14.86%; not positive impacted10, accounted for4.5%8. The study of the222supernumerary teeth, root does not bend192accounting for86.49%; tooth root bending30, accounted for13.53%. Preoperative super-numerary tooth root is bent, can effectively prevent the occurrence of roots bend during the operation.9. The study of clinical222supernumerary teeth type, all bone lie low type (Ⅱ type)166, accounting for74.77%; all embedded high type (type Ⅲ)23, accounting for10.36%; part of embedded type (type Ⅰ)33, accounted for14.86%. Children over the age of12supernumerary teeth in all embedded high type (type Ⅲ),6-8years old in all bone lie low type (type Ⅱ), with a correlation between age and Embedded Supernumerary Teeth in maxillary anterior type of statistical significance (p=0.000). Supernumerary teeth if not promptly removed from all bone lie low type (type Ⅱ) into all embedded high type (type III). 10. With the correlation between the222supernumerary teeth were age and on adjacent teeth of statistical significance (p=0.023). The effects on adjacent teeth showed a shift in maxillary central incisor gap is big, far, lateral incisor adorable out insufficient clearance; maxillary central incisors, lateral, torsional lip late adorable or impacted.11. The study of the222supernumerary teeth by preoperative CBCT precise positioning, determine the path after the operation, were successfully removed. Extraction of supernumerary teeth morphology and position and preoperative CBCT measurement consistency of100%, operation approach and accurate operation, little trauma, short operation time, less pain for children, less postoperative complications.Conclusion:1. Clinical age and medical reason, anterior maxillary impacted supernumerary teeth type and effect on adjacent teeth are highly correlated, supernumerary teeth should be found early, early removal of, can reduce the operation difficulty, reduce the impact on normal dentition.2. Embedded Supernumerary Teeth in maxillary anterior teeth of the age and the size is not relevant, supernumerary teeth developmental age most early to permanent central incisors.3. CBCT examination for the precise location of Embedded Supernumerary Teeth in maxillary anterior approach, guide operation, reduce operation wound,shorten operation time, relieve pain, reduce the postoperative complications has important significance.